| Re: [GMCnet] Another fan clutch story [message #95964] |
Sun, 15 August 2010 19:12  |
James Moore
Messages: 71
Registered: January 2004
Karma:
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Member |
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Gene,
Here is a good website on fan clutches which anwers many questions asked on
here.
http://www.haydenauto.com/Featured%20Products-Fan%20Clutches%20and%20Fan%20B
lades/Content.aspx
Notice what it says about operating temperatures for Chevy truck clutches.
Notice that fans are always turning at least at 20% of engine speed. As to
the question of clutches engaging at cruise, consider that all the cars I
have with electric fans operate the fan continously when the A/C is
switched on. One of them is a Porsche with both an electric fan and a
mechanical fan with a clutch. The electric fan starts as soon as the A/C
is switched on even if the engine is running.
Not sure where the theory that a fan can block air flow through a radiator.
Guess it could it if stopped but that is never the case.
I sometimes think GMC owners look for problems and are unhappy when they
can't find any. As far as I am concerned, engine temps anywhere between
180 F and 220 F are OK. I expect to see changes in engine temperature as
the load and outside temperatures change. I don't care how often the
clutch cycles as long as the engine temp stays below 220 F. I have both
the factory temp and an aftermarket temp gauges installed. The factory
gauge is very sluggish and often does not change going up and down hills
while the after market gauge goes from 190 F to 210 F and back to 190 F.
> [Original Message]
> From: Mr.erf ERFisher <mr.erfisher@gmail.com>
> To: <gmclist@temp.gmcnet.org>
> Date: 8/12/2010 8:05:07 AM
> Subject: Re: [GMCnet] Another fan clutch story
>
> >
> > Important Principle: Fan clutches should never engage during highway
> > cruise.
> > Ram air-induced air flow should be enough to control the temperature.
> >
> > who says this is true?
> where is this written?
>
> I have never seen this on a GMC, and have never read this to be a fact???
>
>
>
> gene
>
>
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
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